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MathGroup Archive 2001

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Re: SetDelayed problems with matrix operation

  • To: mathgroup at smc.vnet.net
  • Subject: [mg27384] Re: [mg27341] SetDelayed problems with matrix operation
  • From: Tomas Garza <tgarza01 at prodigy.net.mx>
  • Date: Thu, 22 Feb 2001 02:25:33 -0500 (EST)
  • References: <200102210817.DAA00392@smc.vnet.net>
  • Sender: owner-wri-mathgroup at wolfram.com

Try the following:

{x1[t_], x2[t_], x3[t_]} := Evaluate[MatrixExp[A t].{b1, 0, 0}];

Tomas Garza
Mexico City

----- Original Message -----
From: "SANCHEZ DE LEON, Guillermo" <gsl at fab.enusa.es>
To: mathgroup at smc.vnet.net
Subject: [mg27384] [mg27341] SetDelayed problems with matrix operation


> Given a square matrix such as
>
> A={{-3, 0, 0.05}, {0.8, -0.01, 0}, {0, 0.01, -0.05}}
>
> I wish evalute the expresion:
>
> { x1[t_], x2[t_], x3[t_]} : = MatrixExp[A t].{b1, 0, 0}
>
> I receive the message
>
> SetDelayed::"shape": "Lists{ x1[t_], x2[t_], x3[t_] } and  MatrixExp[A t)]


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